// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_COMPILER_SIMPLIFIED_LOWERING_H_
#define V8_COMPILER_SIMPLIFIED_LOWERING_H_

#include "src/compiler/js-graph.h"
#include "src/compiler/machine-operator.h"
#include "src/compiler/node.h"
#include "src/compiler/simplified-operator.h"

namespace v8 {
namespace internal {
    namespace compiler {

        // Forward declarations.
        class NodeOriginTable;
        class RepresentationChanger;
        class RepresentationSelector;
        class SourcePositionTable;
        class TypeCache;

        class V8_EXPORT_PRIVATE SimplifiedLowering final {
        public:
            SimplifiedLowering(JSGraph* jsgraph, JSHeapBroker* broker, Zone* zone,
                SourcePositionTable* source_position,
                NodeOriginTable* node_origins,
                PoisoningMitigationLevel poisoning_level);
            ~SimplifiedLowering() = default;

            void LowerAllNodes();

            void DoMax(Node* node, Operator const* op, MachineRepresentation rep);
            void DoMin(Node* node, Operator const* op, MachineRepresentation rep);
            void DoJSToNumberOrNumericTruncatesToFloat64(
                Node* node, RepresentationSelector* selector);
            void DoJSToNumberOrNumericTruncatesToWord32(Node* node,
                RepresentationSelector* selector);
            void DoIntegral32ToBit(Node* node);
            void DoOrderedNumberToBit(Node* node);
            void DoNumberToBit(Node* node);
            void DoIntegerToUint8Clamped(Node* node);
            void DoNumberToUint8Clamped(Node* node);
            void DoSigned32ToUint8Clamped(Node* node);
            void DoUnsigned32ToUint8Clamped(Node* node);

        private:
            JSGraph* const jsgraph_;
            JSHeapBroker* broker_;
            Zone* const zone_;
            TypeCache const* type_cache_;
            SetOncePointer<Node> to_number_code_;
            SetOncePointer<Node> to_number_convert_big_int_code_;
            SetOncePointer<Node> to_numeric_code_;
            SetOncePointer<Operator const> to_number_operator_;
            SetOncePointer<Operator const> to_number_convert_big_int_operator_;
            SetOncePointer<Operator const> to_numeric_operator_;

            // TODO(danno): SimplifiedLowering shouldn't know anything about the source
            // positions table, but must for now since there currently is no other way to
            // pass down source position information to nodes created during
            // lowering. Once this phase becomes a vanilla reducer, it should get source
            // position information via the SourcePositionWrapper like all other reducers.
            SourcePositionTable* source_positions_;
            NodeOriginTable* node_origins_;

            PoisoningMitigationLevel poisoning_level_;

            Node* Float64Round(Node* const node);
            Node* Float64Sign(Node* const node);
            Node* Int32Abs(Node* const node);
            Node* Int32Div(Node* const node);
            Node* Int32Mod(Node* const node);
            Node* Int32Sign(Node* const node);
            Node* Uint32Div(Node* const node);
            Node* Uint32Mod(Node* const node);

            Node* ToNumberCode();
            Node* ToNumberConvertBigIntCode();
            Node* ToNumericCode();
            Operator const* ToNumberOperator();
            Operator const* ToNumberConvertBigIntOperator();
            Operator const* ToNumericOperator();

            friend class RepresentationSelector;

            Isolate* isolate() { return jsgraph_->isolate(); }
            Zone* zone() { return jsgraph_->zone(); }
            JSGraph* jsgraph() { return jsgraph_; }
            Graph* graph() { return jsgraph()->graph(); }
            CommonOperatorBuilder* common() { return jsgraph()->common(); }
            MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
            SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
        };

    } // namespace compiler
} // namespace internal
} // namespace v8

#endif // V8_COMPILER_SIMPLIFIED_LOWERING_H_
